body{
    background: #aacccc;
}
h2{
    text-align: center;
}
.container{width: 600px;
    margin: 50px auto;
}
.container div{
    box-sizing:border-box;
    border: solid 1px;
    width: 200px;
    height: 200px;
    float: left;
    text-align: center;
    background:white;
    -webkit-transition: 0.5s;
    -moz-transition: 0.5s;
    transition: 0.5s;
    z-index: 1;
}
.container div:hover{
    -webkit-transform: scale(1.1);
    -moz-transform: scale(1.1);
    transform: scale(1.1);
    z-index: 2;
}